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2. Kleihauer–Betke test - Wikipedia

   en.wikipedia.org/wiki/Kleihauer–Betke_test

   The Kleihauer–Betke ("KB") test, Kleihauer–Betke ("KB") stain, Kleihauer test or acid elution test is a blood test used to measure the amount of fetal hemoglobin transferred from a fetus to a mother's bloodstream. [1]